Neutron irradiation effect on site distribution of cations in non-stoichiometric magnesium aluminate spinel

Radiation-Induced Effects on Material Properties of Ceramics: Mechanical and Dimensional Properties

“…Further work is needed to clarify the chemical effect of implanted ions on the amorphization of spinel structure oxides. 279,280 The microstructure evolution of MgAl2O4 was investigated extensively for irradiation with heavy ions from several hundred keV to a few MeV, which mainly induce displacement cascades, by means of XRD analysis, [281][282][283] electron diffraction and TEM analysis, 284 electron channeling X-ray analysis (HARECXS: High Angular Resolution Electron Channeling X-ray Spectroscopy) in TEM, 285,286 and RBS/ C. 278,287 Those investigations have found that MgAl2O4 follows the progressive microstructure change with increasing irradiation fluence as follows: (1) exchange of cations (Al and Mg ions) between octahedral and tetrahedral sites, (2) preferential occupation of cations at octahedral sites to form the defective rock-salt structure. There is also an approach to interpret the evolution of radiation-induced nano scale microstructure with the short-and long-range order analysis, which will be described in the nextSection (4.4) and (3) MgAl2O4 finally undergoes a transition to the amorphous state.…”

Super-Paramagnetic Nanoparticles with Spinel Structure: A Review of Synthesis and Biomedical Applications

“…Thus, MS plays the role of an important technique to analyze Fe cations in the lattice spinel materials. There are several reports explaining how to obtain this information using ND [34][35][36][37] and MS [38,39]. As it can be seen, great efforts have been made to evaluate the cationic distribution in spinel ferrites.…”